For those of you keeping track: the Cobol grammar in Koopa just got a major update thanks to a contribution by Adrian Noguero. Koopa now parses more files in the testsuite than before, and overall coverage of the parsed files has gone up to 98.92%! There are lots of source files which score a perfect 100% coverage. That means that for those files Koopa is able to categorize all tokens.
Adrian: thanks man!